Exercise device



FIG. 1 is a front side perspective view of an exercise device;

FIG. 2 is a side view of the exercise device of FIG. 1;

FIG. 3 is a top view of the exercise device of FIG. 1; and,

FIG. 4 is a front view of the exercise device of FIG. 1.

The dash-dash-dash broken lines illustrate environmental structure and form no part of the claimed design. The dash-dot-dash broken lines define the boundaries of the claimed design and form no part thereof. 

CLAIM The ornamental design for an exercise device, as shown and described. 